External mute for brass musical instruments



FIG. 1 is a top, front and right side perspective view of an external mute for brass musical instruments showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a back elevational view thereof;

FIG. 4 is a front elevated view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is an enlarged front perspective view thereof. 

I claim the ornamental design for an external mute for brass musical instruments, as shown and described. 